Sorry haven't answered straight away and that it's in wrong section. It's a
genuine inquiry. My dad phoned me today and said he'd been invited on one
of these swan-upping thingies. For some reason he thought I'd know lots
about it because I go bird watching. I just wanted to get him a book for a
sort of family joke!
I know all that, I think it goes back to medieval times. They ring and weigh
the cygnets and then put them back. That's about my knowledge. If I'd
known sooner I could have got my dad a book for fathers day which is this
sunday.